Infecção natural pelo Vírus Sincicial Respiratório Bovino (BRSV) no Estado de Alagoas

Pesquisa Veterinária Brasileira

Paulo V. Peixoto²  Rinaldo A. Mota¹  Marilene F. Brito¹  Luís G. Corbellini¹  David Driemeier¹  Maria Izabel De Souza¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Instituto de Zootecnia Depto Nutrição e PastagemSeropédica RJ

关键词: BRSV infection;    cattle;    Northeast Brazil;    Vírus Sincicial Respiratório Bovino;    BRSV;    bovinos;    Nordeste do Brasil;   

DOI  :  10.1590/S0100-736X2000000400008

来源: SciELO

【 摘 要 】

Cases of bovine respiratory syncytial virus (BRSV) infection affecting calves in the State of Alagoas, Brazil, are described. At least 220 calves, which were the progeny of Brown Swiss and Holstein Friesian cattle imported from Germany, Austria, and Uruguay, have died from the disease since 1995. Clinical signs included fever, dry cough, serous ocular discharge and, towards the final stages, marked dyspnea. On auscultation there were loud and harsh breathing sounds, and a strong wheezing could be heard from a distance. Histopathology of the lung revealed interstitial pneumonia associated with syncytial cells and infiltration by lymphocytes and eosinophils. A few plasma cells containing Russel bodies in their cytoplasm were also observed. There was hyperplasia of type II pneumocytes and mild squamous metaplasia of the respiratory epithelium. Bronchiolar epithelial cells and syncytial cells were positively stained with anti-BRSV antibody. The finding of BRSV infection in calves in Northeast Brazil plus identical findings already reported from South Brazil, strongly indicate the need for a wide epidemiologic survey in order to evaluate the losses due to BRSV infection and the incidence of infected cattle. There is evidence that at least part of the imported animals involved in this outbreak was already infected on arrival at the port of Belém, in the State of Pará, Brazil.

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